A golf club according to one aspect of the present invention includes a shaft, a golf club head including a hosel containing a hole to attach the shaft, and a sleeve system including a body attached to a tip of the shaft and inserted together with the shaft into the hole of the hosel and an adaptor attached to the body so as to enable an adjustment of an axis-directional position with respect to the body and engaging with an upper end of the hosel.
1. A golf club comprising:
1) a shaft;
2) a golf club head formed with a hosel extending along an axial direction, the hosel having a top hole into which a sleeve system is partially inserted, and a bottom hole through which a threaded portion of a screw is inserted, wherein the top hole is furthest from a sole of the golf club head in the hosel axial direction; and
3) the sleeve system, said sleeve system comprising:
A) a cylindrical shaped body extending along an axial direction and partially inserted into the hosel top hole with a bottom end portion, and a top end portion, wherein the bottom end portion of the body touches the bottom hole of the hosel,
said body comprising:
I) grooves of different length on a peripheral surface of the body each formed starting at the same axial position in the bottom end portion and each groove of the grooves of different length terminating at axially different positions in the top end portion;
II) a top aperture, through which the shaft is inserted, extending at least through the top end portion towards the bottom end portion, and attaching to a tip of the shaft; and
III) a bottom aperture extending axially within the bottom end portion, through which the threaded portion of the screw is inserted and containing threading to engage the treaded portion of the screw, said screw securing the body by tension across the screw between the threading of the body and, by way of a head of the screw, a bottom surface of the hosel bottom hole; and
B) a hollow cylindrical shaped adaptor with a portion sitting on a top surface of the hosel and a protrusion portion extending partially across the hole of the hosel, said protrusion portion:
i) permitting the body to lock into axially different positions by:
a) introduction of the protrusion portion of the adaptor into a respective groove of the grooves of different length of the body by rotation of the adaptor, followed by
b) sliding the protrusion portion of the adaptor or the respective groove of the body to selectively engage the protrusion portion with the respective termini of the respective groove thereto introduced into, and
ii) providing compression across the adaptor between the top surface of the hosel and the engaged groove of the body thus preventing the adaptor from coming off of the golf club.
2. The golf club of claim 1 , wherein the grooves on the peripheral surface of the body are linear.